The show dropped to No.7 nationally in the OzTAM rankings from Monday's night's No.4 placing, shedding almost 300,000 viewers on its second night, with just over a million viewers.

That's despite the reality show debuting two new contestants and dropping its second twist - a fake marriage scenario for its newest housemates.

In Perth, Big Brother dropped from tenth to 17th on Tuesday with 72,000 watching, but that might increase once two WA housemates - who are twins - enter the QLD compound in the coming days.MOST-WATCHED TV SHOWS ON TUESDAY: